tabelview RowInSection fatal error swift - ios

Question

I'm a beginner in IOS development in swift. The problem I am facing is: I am building an app using CoreData and the app contains table view and table cell. I can't really explain because of my lack of knowledge so I'm sharing screenshots. I have seen other Questions asked, none of them solved my error. and I have also made a function for context in AppDelegate which is
#available(iOS 10.0, *)
let ad = UIApplication.shared.delegate as! AppDelegate
#available(iOS 10.0, *)
let context = ad.persistentContainer.viewContext
my code for VC is
import UIKit
import CoreData
class MainVC: UIViewController, UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate {
#IBOutlet weak var tableViewmain: UITableView!
#IBOutlet weak var topSegment: UISegmentedControl!
var fetchResultControll: NSFetchedResultsController<Items>!
override func viewDidLoad() {
super.viewDidLoad()
tableViewmain.delegate = self
tableViewmain.dataSource = self
doFetch()
}
func configureCell (cell: ItemsCell, indexPath: IndexPath) {
let item = fetchResultControll.object(at: indexPath) // remember as here
cell.confugringCell(item: item)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableViewmain.dequeueReusableCell(withIdentifier: "ItemsCell", for: indexPath) as! ItemsCell
configureCell(cell: cell, indexPath: indexPath)
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let sections = fetchResultControll.sections{
let sectionInfo = sections[section]
return sectionInfo.numberOfObjects
}
return 0
}
func numberOfSections(in tableView: UITableView) -> Int {
if let allSections = fetchResultControll.sections {
return allSections.count
}
return 0
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 150
}
func doFetch() {
let fetchRequest: NSFetchRequest<Items> = Items.fetchRequest()
let dateSrot = NSSortDescriptor(key: "created", ascending: false)
fetchRequest.sortDescriptors = [dateSrot]
if #available(iOS 10.0, *) {
let controller = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
do {
try controller.performFetch()
}
catch {
let err = error as NSError
print("\(err)")
}
} else {
// Fallback on earlier versions
}
}
//controler willchnge
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableViewmain.beginUpdates()
}
//controlerdidchnge
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableViewmain.endUpdates()
}
//controlerdidchangeanobject
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch(type) {
case .insert:
if let indexpath = newIndexPath {
tableViewmain.insertRows(at: [indexpath], with: .fade)
}
break
case .delete:
if let indexpath = indexPath {
tableViewmain.deleteRows(at: [indexpath], with: .fade)
}
break
case .update:
if let indexpath = indexPath {
let cell = tableViewmain.cellForRow(at: indexpath) as! ItemsCell
configureCell(cell: cell, indexPath: indexpath) // as used here
}
break
case .move:
if let indexpath = indexPath {
tableViewmain.deleteRows(at: [indexpath], with: .fade)
}
if let indexpath = newIndexPath {
tableViewmain.insertRows(at: [indexpath], with: .fade)
}
break
}
}
I hope you understand me.. Any Help would be highly appreciated

Answer 1

Replace following line with your .
var fetchResultControll: NSFetchedResultsController<Items>?